Piston.



PATENTED MAY 29, 1906.

H. T. JONES.

PISTON.

APPLICATION FILED JAN. 27. 1905.

Mm $41M UNITED STATES PATENT OFFICE.

HORATIO THOMAS JONES, OF MELBOURNE, VICTORIA, AUSTRALIA,

ASSIGNOR OF ONE-HALF TO JOHN PETER LUDEMAN, OF MEL- BOURNE, VICTORIA,AUSTRALIA.

PISTON.

Specification of Letters Patent.

Patented May 29, 1906.

Application filed January 2'7, 1905. Serial No. 242,934-

JoNEs, engineer, a subject of the King of.

Great Britain, residing at 31 Spring street, Melbourne, in the State ofVictoria, Australia, have invented Improvements in Pistons, of which thefollowing is a specification.

This invention relates to improvements in pistons whereby they may bereadily fitted together, and also to the means for securing the packingaround same, as will be understood by reference to the accompanyingdrawings, whereof Figure 1 is a central section through a piston, andFig. 2 is a similar view witha slight difference.

According to this invention the head of the piston is preferably formedof a pair of dished metallicplates 1 2, provided, respectively, withupwardly and downwardly projecting flanges 3 4, to which the annularpacking of felt or other suitable material 5 is secured. The outerperiphery of each flange is formed with a groove 6, and the packinghaving a similar groove 7 is fastened in position by a wire 8, whichencircles same and presses it into the groove in the flange. The ends ofthe wire pass through a hole in the flange, where they are fastened to abutton or rotatable key 9, from which they may be readily released whenfound necessary to remove or replace a worn packing.

In order to keep the extreme edges of the packing which overlap theflanges tight against the cylinder, and thus prevent air escapingbetween same and the piston, narrow spring-hoops 10 may be placedagainst the inside face of the packing or between the flange and thepacking, as shown in the draw- 111 s.

lhe plates 1 2 are provided with openings in the center to enable themto pass freely over the piston-rod 11, and said rod is provided near itsupper end with a collar 12, upon which the lower plate 2 rests. Aspacing-sleeve 13 may be then slipped over the rod, and against itsupper end the upper plate 1 rests, the whole being clamped togetherrigidly by a nut 14 on the end of the rod, which is screwed down againstsaid upper plate. 1 The sleeve is not essential and may be dispensedwith, as the plates are jammed together at their peripheries.

When a hollow rodis employed, as in the drawings, the nut 14 has acentral plug 15, adapte to close the end of the rod.

The piston, as described, has virtually a hollow head and is providedwith two independent annular packings but it will be ob vious that asingle one may be attached to both flanges in this manner or that bydispensing with the lower plate and connecting the sleeve 13 to theupper one, as in Fig. 2, a single ring of packing may be attached to theflange of the upper platea construction which will be found useful insmall blowers or air-pumps.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. An improved piston-head comprisin a dished plate, aflange on the outer edge thereof, a packing of felt abutting against anddetachably connected to the flange, substantially as set forth.

2. A piston comprising a dished plate, a flange on the outer edgethereof, a packing of felt detachably connected thereto and springhoopsseated on the edge of the flange and engaging the inner face of thefelt, substantially as set forth.

3. A piston comprising a pair of dished plates, flanges thereonrespectively bent upwardly and downwardly, and a packing of suitablematerial abutting against and detachably secured to each plate,substantially as set forth.

4. In a piston, a hollow head comprising a pair of abutting dishedplates with an annular felt packing around the flanges thereof and meansfor drawing the plates toward each.

other, substantially as set forth.

5. A piston comprising a pair of dishedshaped plates, each provided witha flan e, a packing abutting against the peripheryo the flanges and ofgreater width, and means for detachably securing the packing to theflanges.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit nesses.

HORATIO THOMAS JONES. Witnesses:

EDWARD WATERS, WALTER O. HART.

